Product Introduction

This precision-machined spline block is a dual-function component that combines the axial spacing of a thrust washer with the torque transfer of a splined coupling.

• Structure & Material: Made from high-strength alloy steel, it features an internal spline profile for torque transfer, a flat thrust surface for axial positioning, and four radial slots to accommodate lubrication and thermal expansion. The surface is precision-ground for accuracy and corrosion resistance.

• Performance: The precisely controlled thickness ensures accurate axial spacing, while the internal splines lock onto shafts to transmit torque. The radial slots allow gear oil to flow freely, reducing friction and wear.

• Durability: The hardened steel construction withstands high torque loads and friction, maintaining its shape and precision over time.

• Compatibility: Direct OE replacement, fully matching the spline count and dimensional specifications of the HW19710 transmission.

Core Function

1. Torque Transfer: The internal splines lock onto the transmission shaft, transferring rotational torque between components.

2. Axial Positioning: The flat thrust surface maintains precise spacing between gears and bearings, controlling endplay and preventing misalignment.

3. Lubrication Enhancement: The radial slots allow gear oil to flow between mating surfaces, reducing friction and extending component life.

Spline Block WG2210040012 for SINOTRUK HW Series Gearbox – Factory Direct Supply

When your SINOTRUK HW series gearbox demands a reliable spline block replacement, precision matters more than anything. The Spline Block WG2210040012 is engineered to deliver exact OEM-grade fitment, ensuring smooth torque transmission and extended gearbox life. As a factory-direct supplier of genuine SINOTRUK gearbox components, Mettlead brings you this critical transmission part at competitive pricing — without compromising on quality or delivery speed.

Why This Spline Block WG2210040012 Matters for Your Gearbox

The spline block sits at the heart of your HW series transmission, acting as the critical interface that transfers rotational force between mating components. Over time, wear and heavy-duty operation can degrade this part, leading to gear slippage, abnormal noise, and reduced shifting precision. Replacing it with a properly manufactured WG2210040012 spline block restores your gearbox to peak performance — and that means less downtime and lower maintenance costs for your fleet.

Key Features and Benefits

• Exact OEM Specification: Manufactured to match the original SINOTRUK HW gearbox spline block dimensions, hardness, and tooth profile — ensuring a drop-in replacement with zero modification needed.
• Premium Material Construction: Forged from high-strength alloy steel with precise heat treatment, delivering superior wear resistance under heavy-load conditions.
• Extended Service Life: Optimized surface finish reduces friction between mating splines, which translates directly into longer component lifespan and fewer replacements.
• Strict Quality Control: Every batch undergoes dimensional inspection, hardness testing, and surface quality checks before leaving the factory.
• Cost-Effective Maintenance: Factory-direct pricing from Mettlead means you get OEM-quality parts at significantly lower cost compared to dealer channels.
• Fast Global Shipping: Ready stock with reliable logistics partners ensures your parts arrive on schedule, keeping your fleet moving.

Technical Specifications – Spline Block WG2210040012

Application Scenarios – Where Does This Spline Block Fit?

The Spline Block WG2210040012 is specifically designed for the SINOTRUK HW series gearbox family. If you are managing a fleet of HOWO heavy trucks or sourcing gearbox parts for repair workshops, this is the exact component you need. Here is where it applies:

• Compatible Gearbox Models: HW19710, HW15710, HW20716, and other HW series variants
• Compatible Vehicle Models: SINOTRUK HOWO A7, HOWO T7H, HOWO T5G, SITRAK C7H, and other heavy-duty trucks equipped with HW transmissions
• Function in Gearbox: Serves as the torque-transmitting spline cushion block within the transmission assembly, maintaining proper alignment and force distribution between gear shafts

Whether you are rebuilding a complete gearbox or replacing a single worn component, this spline block ensures your SINOTRUK HOWO gearbox parts assembly operates at full specification.

OEM/ODM Capabilities and Custom Packaging

At Mettlead, we understand that different markets have different branding and packaging requirements. That is why we offer flexible options beyond standard supply:

• White-Label Supply: Receive spline blocks in neutral packaging, ready for your own branding and distribution.
• Custom Packaging: We can print your logo, part numbers, and brand identity on boxes and labels — perfect for distributors building their own parts brand in local markets.
• Bulk Order Support: Whether you need 50 pieces or 5,000 pieces, our production capacity scales to meet your demand without sacrificing lead times.
• Quality Documentation: Inspection reports, material certificates, and dimensional test records provided on request for your quality assurance requirements.

Explore our full range of SINOTRUK HOWO truck parts and spare parts to see what else we can supply alongside your gearbox components.

Customer Case Study – Spline Block WG2210040012 Bulk Order for East African Fleet

Earlier this year, a fleet maintenance company based in Kenya reached out to Mettlead with an urgent requirement. They were managing over 120 SINOTRUK HOWO trucks operating on long-haul routes, and multiple gearboxes were showing early signs of spline wear. Their local suppliers could not guarantee OEM-grade quality for the Spline Block WG2210040012, and delivery timelines were unreliable.

After reviewing their requirements, we supplied 300 units of the WG2210040012 spline block with full inspection documentation. The parts were shipped within 7 working days and arrived via consolidated sea-air freight in under 3 weeks. Following installation, their maintenance manager reported zero premature failures across the first 6-month review period — a clear improvement over their previous third-party sourcing channel.

This is exactly the kind of result that makes factory-direct sourcing worthwhile. When you know the parts are built to specification and backed by proper quality control, your total cost of ownership drops significantly.

Frequently Asked Questions – Spline Block WG2210040012

What is the function of Spline Block WG2210040012 in the HW gearbox?

The spline block acts as a torque-transmitting cushion between mating gear shafts inside the HW series transmission. It absorbs micro-vibrations during gear engagement and ensures proper force distribution across the spline interface. Without a properly functioning spline block, you will notice gear noise, shifting difficulty, and accelerated wear on surrounding components.

How do I confirm that WG2210040012 fits my specific gearbox model?

This part number is standardized across the SINOTRUK HW gearbox family, including HW19710, HW15710, and HW20716 variants. However, if you are unsure, simply provide your gearbox nameplate number or vehicle VIN, and our technical team will confirm compatibility before you order.

What material is this spline block made from, and how does it compare to the original?

Our WG2210040012 spline block uses high-strength alloy steel with controlled heat treatment to achieve surface hardness of HRC 58–62 — matching the original factory specification. The material composition and processing ensure the same fatigue resistance and wear characteristics as the OEM component.

Can I order just one piece for testing, or is there a minimum order quantity?

We offer flexible MOQ for the Spline Block WG2210040012. Sample orders are welcome so you can verify fitment and quality before committing to larger volumes. Once satisfied, we can arrange bulk pricing for ongoing supply.

What are the common signs that this spline block needs replacement?

Typical indicators include unusual knocking or rattling sounds during gear shifting, increased resistance when engaging gears, visible wear marks or micro-pitting on the spline surfaces during teardown inspection, and excessive play between mating components. If your gearbox has exceeded 300,000 km without a spline block inspection, preventive replacement is highly recommended.

Does the spline block come with any warranty or quality guarantee?

Every Spline Block WG2210040012 supplied by Mettlead passes our strict quality control process, including dimensional checks and hardness testing. We stand behind the quality of our parts — if any manufacturing defect is identified, we will replace the component at no additional cost.

Browse More Gearbox Parts and Components

Looking for additional gearbox parts and transmission components? Mettlead carries a comprehensive range of synchronizer rings, gear shafts, bearings, seals, and other HW series gearbox spares — all available at factory-direct pricing with the same strict quality standards.

Ready to Source Your Spline Block WG2210040012? Let’s Talk.

You have read the specs, you have seen the quality commitment, and you know the pricing advantage of buying factory-direct from China. Now it is time to take the next step. Whether you need a sample for validation or a bulk order for your warehouse, our team is ready to provide a fast quotation with clear lead times.

Get your quote today — Contact Us with your required quantity and destination, and we will respond within 24 hours with pricing, availability, and shipping options for the Spline Block WG2210040012 SINOTRUK HW Series Gearbox.

Mettlead — Your trusted factory-direct source for SINOTRUK, HOWO, SITRAK, SHACMAN, FAW, WEICHAI, DONGFENG, and FOTON truck parts worldwide.